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NHF-ST12
AWS Specification: ECoCr-B
JIS Specification:

NONE

Other Specification:

I. APPLICATIONS:

Hard surfacing of valve sleeves of high pressure pump, cutting knives, liner sleeves, valve seats and dies, etc.

II. DESCRIPTION :

NHF-ST12 Covered electrode develop high hardness and abrasion resistance and good corrosion resistance. These properties make NHF-ST12 the choice for wood cutting saws and bars and for industrial cutting applications for carpet, plastics, papers, and chemical industries. It is non- forgeable and can be machines with difficulty using carbide tools. NHF-ST12 bonds well to all weldable-grade steels, including stainless.

      III. NOTES ON USAGE:

 

  • Preheat at 300ºC and over in general. Use NIHONWELD temperature indicating sticks or NIHONWELD interpass temperature gauge to determine if proper temperature is achieve before welding. For more details see NIHONWELD Chart 4 Easy Steps for welding. 

  • It is effective to postheat at 600ºC and to slow cool after welding to prevent cracking.    

  • Dry the electrodes at 150-200ºC for 30 – 60 minutes before use.  Use NIHONWELD portable drying ovens.

IV. HARDNESS OF WELD DEPOSIT: 42 – 48 HRC (410 – 490 Hv)

V. TYPICAL CHEMICAL COMPOSITION OF WELD METAL (%):

 

C

Si

Mn

Cr

W

Co

1.43

0.56

0.98

31.62

8.67

Balance

VI. WELDING POSITIONS: FLAT, VERTICAL UP, OVERHEAD

VII. SIZES AVAILABLE AND RECOMMENDED CURRENTS ( DC + ):

  

Size

Dia

3.2

4.0

5.0

(mm)

Length

350

350

350

Current Range

90-120

110-150

140-180

 TEST RESULT

The information contained or otherwise referenced herein is presented only as “typical” without guarantee or warranty, and Industrial Welding Corporation expressly disclaims any liability incurred from any reliance thereon. Typical data and Test results for mechanical properties, deposit or electrode composition and other properties were obtained from a weld produced and tested according to prescribed standards, and should not be assumed to be the expected results in a particular application or weldment. Actual results will vary depending on many factors, including, but not limited to, weld procedure, plate chemistry and temperature, weldment design and fabrication methods. Users are cautioned to confirm by qualification testing, or other appropriate means, the suitability of any welding consumable and procedure before use in the intended application.